Celestial hemisphere:  Southern  ·  Constellation: Vela (Vel)  ·  Contains:  HD71336  ·  HD71459  ·  HD71527  ·  HD71528  ·  HD71544  ·  HD71607  ·  HD71609  ·  HD71650  ·  HD71692  ·  HD71742  ·  HD71857  ·  HD71872  ·  HD71915  ·  HD71932  ·  HD71967  ·  HD71998  ·  HD72014  ·  HD72015  ·  HD72125  ·  HD72139  ·  HD72160  ·  HD72161  ·  HD72317  ·  HD72318  ·  HD72319  ·  HD72320  ·  HD72348  ·  HD72384  ·  HD72386  ·  HD72436  ·  And 218 more.
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Nebulae GUM 14, 15, & 17, H & O emissions in the Vela Molecular Ridge, Paul Lloyd
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Nebulae GUM 14, 15, & 17, H & O emissions in the Vela Molecular Ridge

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Nebulae GUM 14, 15, & 17, H & O emissions in the Vela Molecular Ridge, Paul Lloyd
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Nebulae GUM 14, 15, & 17, H & O emissions in the Vela Molecular Ridge

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Description

The huge Vela Molecular Ridge is so large that it has been broken up into well defined regions for easier
identification. The regions known as VMR D (left) and VMR C are closest to us at 2,300 to 3,300 ly away
and hosts the bright nebulae shown in this image. They are, from left to right Gum 17, Gum 15 (small
central nebula), and Gum 14.

The largest nebula, Gum 14/RCW 27, shows numerous clusters of hot young stars, many buried within
the cloud, but observable via I.R. photometry. They are responsible for this being an active H-II region.
It also has the reflection nebula, NGC 2626 which is not shown by the emission nebulae filter used here.

The small nebula, Gum 15/RCW 32, hosts the star cluster, Collinder 197 (Cr 197), which is responsible
for the nebula’s emissions. It also is an active H-II region, being energised by the B-Class stars populating
Cr 197.

Finally, Gum 17/RCW 33 is yet another H-II region hosting either/both the cluster Trumpler 10 and the
O-Class very hot star, HD 75759. As these are at quite different distances, it makes determining the
distance of Gum 17 difficult.

Extending further left and down (south-east) of Gum 17 can be seen the very small Gum 19/RCW 34,
and Gum 20/RCW 36, both members of the VMR. Additionally, the top edge of the famous Vela Supernova
Remnant intrudes at the lower edge of this image.

I have used a triband H+O filter here in order to display the nebulosity of this complex region in
greater detail.



Telescope: Canon EF 70-200mm lens + 1.4x teleconverter @ f=100mm
Camera:     ZWO ASI183MC Pro
Exposure:  54 x 300 sec, Optolong L-eNhance filter, gain=250
                    Bortle 3-4 sky, 75% Moon waning
Field of View: approx. 5º 50’ x 4º 10’
Image processed and prepared in PixInsight and Photoshop Elements

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Nebulae GUM 14, 15, & 17, H & O emissions in the Vela Molecular Ridge, Paul Lloyd